package com.admin.common.shiro;

import java.io.Serializable;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.shiro.web.servlet.ShiroHttpServletRequest;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.util.StringUtils;

/**
 * session管理器，自定义sessionId获取
 * 
 * @author ZY
 * @date 2018/10/18
 */
public class WebSessionManager extends DefaultWebSessionManager {

    private static final String TOKEN = "token";

    private static final String REFERENCED_SESSION_ID_SOURCE = "Stateless request";

    public WebSessionManager() {
        super();
    }

    @Override
    protected Serializable getSessionId(ServletRequest request, ServletResponse response) {
        String id = WebUtils.toHttp(request).getHeader(TOKEN);
        // 如果请求头中有 token 则其值为sessionId
        if (!StringUtils.isEmpty(id)) {
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_SOURCE, REFERENCED_SESSION_ID_SOURCE);
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID, id);
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_IS_VALID, Boolean.TRUE);
            return id;
        } else {
            // 否则按默认规则从cookie取sessionId
            return super.getSessionId(request, response);
        }
    }
}
